Service manual

MASTER FEED March 2006
6-16
6.7.2 MASTER FEED MECHANISM
Mechanism
Master feed motor [A] (stepper motor)
↓
Gears [B]
↓
Platen roller [C], master feed roller [D]
↓
Feeds the master (The thermal head makes an image on the master.)
Procedure
1. After the old master has been ejected, the drum stops at the master feed
position and the master clamper opens, ready to clamp the new master.
2. When the clamper is open, the tension roller releases and the master is fed to
the clamper on the drum. For details of the tension roller, see section 6.7.3.
3. After the clamper closes, the master feed motor feeds the master while the
drum rotates intermittently at 30 rpm. The intermittent rotation keeps a buckle
[F] in the master above the master feed guide to absorb shocks from the
wrapping operation.
4. The tension roller [E] keeps the master under tension. This roller reduces the
master making time, because it allows the drum to turn continuously during
wrapping. Without this roller, if the drum kept turning, the master would crease.
5. The main motor turns off when the drum is at the master eject position. The
master feed motor continues to feed the master until master making completed.
Then the master feed motor turns off, and cutting is done. Then the main motor
turns on again to complete the wrapping.
NOTE: Springs press the thermal head against the platen roller. The pressure is
applied when the master set cover, which includes the platen roller, is
closed.
C267D009.WMF
[A]
[B]
[C]
[D]
[E]
[F]